Mail/X Controls Description:

These controls help you send and receive email from Internet servers.These components are available as both ActiveX controls and COM objects.

How Do I Send Mail With Mail/X?

The answer to this question really depends on what kind of message you want to send. There are three methods available - SendMail, SendMessage or SendMessages.


SendMail Method

The simplest way to send mail with Mail/X is to use SMTP/X's SendMail method. It is an easy to use one-line method but with limited functionality.

SendMail's IDL declaration is:

HRESULT SendMail(BSTR From, BSTR To, BSTR Subject, BSTR Body, [optional, in] VARIANT * Filename, [optional, in] VARIANT * EncodingType);

Translated to VB:

SendMail (From As String, To As String, Subject As String, Body As String, [Filename], [EncodingType])

It takes only a few parameters - the "From" and "To" addresses, "Subject", and the "Body" of a message. Optionally, a file can be attached. The fact that the Filename parameter is actually a variant is of no importance to you if you use VB. However, some other languages don't convert automatically from string to variant and vice versa.

Use SendMail like this:

Private Sub cmdSendMail_Click()
Dim smtp As New SmtpX
smtp.ConnectionType = SMTPConnection
smtp.Blocking = True
smtp.Host = "mail.host.com"
smtp.Connect
smtp.SendMail "Bob@mabry.com", "Bob.Smith@mabry.com ", "The subject", "And the body", App.Path & "attachme.zip"
smtp.Disconnect
End Sub

Let's take a look at this code. First, I'm using the COM object here. That's the "Dim smtp…" line.

The ConnectionType is set to SMTPConnection - the alternative is ESMTPConnection, and you will usually use it when you talk with an Exchange server. So, if you get error 550 ("Relaying not allowed" or something like that - the exact error message depends on the server), set the ConnectionType to ESMTPConnection, and set the LogonName and LogonPassword also. There is no way to query the server as to which connection type it requires.

Blocking is set to True. When set like this, your application will wait until each command sent to the server (Connect, SendMail and Disconnect in this sample) is completed. SendMail will not get executed until Connect is completed, and Disconnect will wait for SendMail to finish. You can use non-blocking (Blocking = False) also, but the code is a bit more complicated. We'll talk about blocking vs. non-blocking more later.

Connect will try to connect to the server, and return with success or with an error - e.g. if the host doesn't exist or is unreachable, or the logon information is incorrect.

Then we send our mail, and then disconnect.

Note: in the current version of the control, no matter which EncodingType you specify, the attached file will always be encoded to base64.

Mail/X Controls security information

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Enjoy!